This is  Betts FRENCHIE Block Heeled Knee Boots. 

FRENCHIE combine the charm of a sleek knee-high design with the practicality of a sturdy block heel for all-day comfort and undeniable style. The square toe adds a modern edge, making these boots a chic staple for both casual and dressy occasions. For an effortlessly stylish vibe, pair them with a knit midi dress and a tailored coat, or go bold by rocking them with a leather mini skirt and a turtleneck. Want a laid-back look? Style them with skinny jeans, an oversized blazer, and a crossbody bag.